How many terms of the Arithematic Progression 1,6,11,16,.... must be taken so that their sum is148 ?
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Sn is 148
common difference is 5
a is 1
sn=n/2 (2a+(n-1)d)
148=n/2 (2+5n-5)
296=3n+5n^2
5n^2 + 3n -296=0
now solve it
common difference is 5
a is 1
sn=n/2 (2a+(n-1)d)
148=n/2 (2+5n-5)
296=3n+5n^2
5n^2 + 3n -296=0
now solve it
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