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221 = 13 X 17
So, 'a' = 13 and 'b' = 17
Therefore, required value = 17
Three of the following four pairs of alphas and numerals have the same relationship between their elements as in the case of the pair PROBLEM : 2948375 ...
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Which figure should replace the question mark (?) if the following figure series were to be continued?
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3, 13, 53, 213,?
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