In an AP the sum of first n term is 5n sq. /2 + 3n /2 . Find its 20 th terms.
Please ans. fast it's urgent .
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S1=5*1*1/2+3*1/2=2.5+1.5=4
S2=5*2*2/2+3*2/2=13
a=4
a2=9
a20=4+19*5=99
S2=5*2*2/2+3*2/2=13
a=4
a2=9
a20=4+19*5=99
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