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find 4 terms forming a geometric progression in which the third term is greater than first term by 9 and second term is greater than 4 th by 18 find the value of n so that a raised to n+1 + b raised to n+1 divided by a raised to n + b raised to n (please do give explanation) one bank gives thousand rupees on interest of 168 rupees for 6 months, another bank gives rupees 100 on interest of 3 rupees per month.borrowing money from which bank is profitable? why?