Next term of AP :√7,√28,√63..
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a=√7
b=√28=√2×2×7 = 2√7
c=√63= √3×3×7 = 3√7
common difference= b-a = 2√7 - √7 = √7
next term is = c+ common difference
= 3√7+ √7
= 4√7
= √4×4×7
= √112
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