find the sum of a.p. of 8,11,14,17,....(15 terms)
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Step-by-step explanation:
435 hoga ..................
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a=8,d=11-8=3,n=15
s=n/2[2a+(n-1)d]
s=15/2[2×8+(15-1)3]
=15/2[16+14×3]
=15/2[16+43]
=15/2[58]
=15×29
=435
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