​please solve the sum and the formula because i cannot solve.

The postal charge for the first village school = Rs 42
the postal charge for the second school         = Rs 63
the postal charge for the third school            = Rs 294
the greatest denomination of stamps he must buy = H.C.F. (highest common factorisation) of 42 , 63 , 294
so the H.C.F is 21, so the greatest denomination of  stamps he must buy to mail the three parcels is 21 , and the correct option is (b) 21


MAY THIS CLEARS YOUR DOUBT

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