PROGRESSIONS-7 4 is the first term in an AP and the total of first 9 terms is twice the total of the initial 6 terms. What will be the common difference?
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Step-by-step explanation:
wkt,1st term of APis 4
a=4
T¹+T²+T³+T⁴+T⁵+T⁶+T⁷+T⁸+T⁹=2(T¹+T²+T³+T⁴+T⁵+T⁶)
9a+45d=2(6a+21d)
3a=3d
a=d=4
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