“∑n2 = n(n+1)(2n+1)/6” has been added to your cart. Continue shopping Product Price Quantity Subtotal 5 x 5 Square Puzzle ₹220.00 5 x 5 Square Puzzle quantity ₹220.00 Gravity Tower ₹1,000.00 Gravity Tower quantity ₹1,000.00 ∑n2 = n(n+1)(2n+1)/6 ₹440.00 ∑n2 = n(n+1)(2n+1)/6 quantity ₹440.00 Coupon: Cart Totals Subtotal ₹1,660.00 2.5% CGST ₹5.50 2.5% SGST ₹5.50 9% CGST ₹129.60 9% SGST ₹129.60 Total ₹1,930.00 Continue Shopping Checkout