The 5th term of a GP is 8. If it's common ratio is 2,. A). Find the first term of the GP? B). Find the sum of its first 15th term
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T5=8
ar^4=8
a*2^4=8
a=1/2
S15=a(r^n-1)/r-1
S15=1/2(2^15-1)/2-1
S15=1/2(32767)
S15=16383.5
ar^4=8
a*2^4=8
a=1/2
S15=a(r^n-1)/r-1
S15=1/2(2^15-1)/2-1
S15=1/2(32767)
S15=16383.5
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