<html><head><style>.frms
{
margin:0 auto;
padding:10px;
width:80%;
border:#ddd 1px solid;
border-radius:.3em;
-moz-border-radius:.3em;
-webkit-border-radius:.3em;
-o-border-radius:.3em;
font-family:Tahoma, Geneva, sans-serif;
color:#333;
font-size:.9em;
line-height:1.2em;
}
.frms input[type="text"],[type="password"],[type="file"],textarea,select
{
width:99%;
background:#fff;
border:#ddd 1px solid;
border-radius:.35em;
-moz-border-radius:.35em;
-webkit-border-radius:.35em;
-o-border-radius:.35em;
padding:0 .5%;
margin-top:5px;
margin-bottom:15px;
height:35px;
}
frms input:hover,textarea:hover,select:hover
{
box-shadow:#dae1e5 0px 0px 5px;
-moz-box-shadow:#dae1e5 0px 0px 5px;
-webkit-box-shadow:#dae1e5 0px 0px 5px;
-o-box-shadow:#dae1e5 0px 0px 5px;
}
.frms input:focus,textarea:focus,select:focus
{
-webkit-box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);
-moz-box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);
box-shadow: inset 7px 4px 7px -7px rgba(0,0,0,0.42);
border:#9d9983 1px solid;
}
.frms input[type="submit"],input[type="reset"],input[type="button"],button,.yellow_button,.blue_button,.green_button
{
padding:7px 14px;
font-weight:bold;
color:#fff;
cursor:pointer;
border-radius:.3em;
-moz-border-radius:.2em;
-webkit-border-radius:.2em;
-o-border-radius:.2em;
margin:10px 0;
border:none;
}
.green_button
{
background:#75ab22 !important;
border-bottom:#629826 3px solid !important;
text-shadow:#396e12 1px 1px 0px !important;
}
input[type="button"],button,.blue_button
{
background:#468cd2;
border-bottom:#3277bc 3px solid;
text-shadow:#214d73 1px 1px 0px;
}
.namee
{font-weight:bold;color:green;
}</style></head>
<body><script type='text/javascript'>
function submit_text()
{var sval = document.getElementById("series").value;var tval = document.getElementById("num").value;if(tval==""){document.getElementById("nerr").innerHTML="<font color=red>Enter number of term</font>";}else{document.getElementById("nerr").innerHTML="";tval = parseInt(tval);if(sval == 1){
res = (tval * (tval+1)) / 2;}else if(sval==2){
res = (tval * (tval+1) * ((2*tval)+1)) / 6;}else if(sval==3){
tone = tval + 1;
res = ((tval * tval) * (tone * tone)) / 4;}else if(sval==4){
res = tval * tval;}else if(sval==5){
res = (tval * (tval+1) * (tval+2)) / 3;}else if(sval==6){
res = tval / (tval+1);}else if(sval==7){
res = (tval * (tval+1) * (tval+2) * (tval+3)) / 4;}else if(sval==8){
fir = tval * (tval+3);
sec = 4 * (tval+1) * (tval+2);
res = fir / sec;}document.getElementById("res").value=res;}
}
function checnum(as)
{var a = as.value;as.value = a.replace(/[^\d.]/g, "");
}
function ctck() {
var sds = document.getElementById("dum");
if(sds == null){
alert("You are using a free package.\n You are not allowed to remove the tag.\n"); }
var sdss = document.getElementById("dumdiv");
if(sdss == null){
alert("You are using a free package.\n You are not allowed to remove the tag.\n"); } }
function reset12()
{document.getElementById("num").value="";document.getElementById("res").value="";document.getElementById("nerr").innerHTML="";document.getElementById("series").value = "1";
}</script>
<h3 align='center' >Sum of Series in Javascript</h3><div class='frms'>
<form name='loginform' method="post" >
<br><div
id='err_msg1'></div><br>
<label>Choose Sequences (K) = <span>Σ</span></label><select id="series"><option value="1">k</option><option value="2">k^2</option><option value="3">k^3</option><option value="4">2k-1</option><option value="5">k(k+1)</option><option value="6">1 / k(k+1)</option><option value="7">k(k+1)(k+2)</option><option value="8">1 / k(k+1)(k+2)</option></select><label>Number of terms (n) : </label><span id='nerr'></span> <input type='text'
id='num'
maxlength=20 onkeyup=checnum(this) /><input
type='button' id='submit_textd' value='Submit' onClick="submit_text()"
/>
<span align=center style="font-size: 10px; color:green;" id="dumdiv"> <a href="https://www.emexee.com" id="dum" style="text-decoration:none; color: green;"></a></span> <input
type='button' id='reset' value='Reset' onClick="reset12()"
/><br><br><label>Sum of Series (<span>Σ</span>) : </label> <input type='text' id='res'
/>
</form>
</div>
</body>
</html>
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