2 + 7 + 12 +....+(5n-3)=n(5n-1)/2
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here the sequence is in AP
S=2+7+12+.............+(5n-3)
we know that:
S=n/2{2a+(n-1)d}
S=n(an +a)/2
S=n(5n-3+2)/2
S=n(5n-1)/2
proved
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S=2+7+12+.............+(5n-3)
we know that:
S=n/2{2a+(n-1)d}
S=n(an +a)/2
S=n(5n-3+2)/2
S=n(5n-1)/2
proved
please mark me brainliest
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